John Travolta mourns ‘Grease’ Costar Olivia Newton-John: 'Your impact was incredible'

The Grease co-star and close friend of John Travolta, Olivia Newton-John, who passed away on Monday at the age of 73, got a tribute from Travolta.

"My sweetest Olivia, you improved all of our lives significantly. Your influence was enormous.

I love you a lot. When we are all back together, we will see each other again.

 From the first second I saw you and forever, "Your Danny, your John!" He captioned a photo of Newton-John on Instagram.

Travolta and Newton-John played Danny Zuko and Sandy Olsson, two opposites who were

Pulled together by destiny in the summer of 1958, in the Randal Kleiser-directed movie.

Her husband John Easterling confirmed death of Newton John on Monday afternoon.

"Dame Olivia Newton-John (73) died peacefully this morning at her Ranch in Southern California, surrounded by her loved ones.

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